Trimming machine



C. M. BREHIVI. TRIMMING MACHINE APPLICATION FILED IAN. 8, I92I.

Patented June 20, 1922.

UNITI-:D smiles CHARLES M. BREHM, or DAYTON. omo.

TRIMMING MACHINE.

Specification of Letters Patent.. Patented June 2,0 1922.

Application filed January 8, 1921. Serial No. 435,976.

To all whom t may concern:

Be it known that I, CHARLES M. BREHM, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented certain new and useful Improvements in Trimmin Machines, ofwhich the following is a speci cation, reference being had therein tothe accompanyin drawing.

y invention relates to mechanism for trimming blanks punch and dieconstruction for this p urpose.

My object is to provide a mechanism for holding a blank in positiondespite the relative movement of the punch and die during a trimmingoperation when a portion of the blank is being trimmed.

Another object is to provide a means of holding the blank while thetrimming is taking place and there is not only a lateral movement but avertical movement of the respective parts of the trimming mechanism.

Referring to the drawings: V

Fig. 1 is a sect-ion of a die and punch with a blank in position justprior to being trimmed;

Fig. 2 is a sectional view somewhat enlarged of one-half of the blankshowing a portion of the top just severed as the result of the trimmingoperation. The particular blank in this inst-ance is a cup-shaped memlerwhich is to be trimmed to form" a cylin- In the drawings, 1 is thesupporting member for a punch which has fastened to it by the pins'2-2,a cam plate 3 with a cam surface 4. This cam plate with its cam surface4 engages with a cooperating member 5 that has a cam surface 6. Themovement of these cam surfaces over one another results in 5 beingshifted laterally together with the punch 7. The punch 7 has adjacent toit a supporting pin 8 upon which the outwardly turned side walls 9 ofthe blank 10 rest. The top of the blank at 11 is spaced away from thetop of the punch 7. The movement of the punch with respect to the die 12is limited by the pin 13 which is grounded oi level with the face of thepunch. This pin 13 cooperates with the corresponding pin 14 carrled bythe die supporting member 15. The

punch and die are guided relative to one another by the pin 16 and thetubular aperture 17 found respectively in the punch and die. The die 12has within it a spring pressed pin 18 that is maintained in its outandin particular to al ermost position, as shown in the drawing,

by the spring 19 within the passage way 20 of the die-supporting member15. The die 12 1s held upon 15 by a pin 21 or threaded member' of anydesired construction. The p1n 18 is limited in the outward movement bythe shoulder 22 which abuts against the bottom of the die 12.

Referring'again to the punch, it will be seen that as it descends underpressure, the descent will be resisted by the helical spring 23 whichsurrounds the guiding in 24 that is loosely fitted'into a guiding p ate25 carried by a stationary-pin 26 aflixed to the punch supportingmember 1. It will also be seen that the connection between 5 and 24 at27 is a exible one to permit ofthe lateral movement to which 5 issubjected due to its passage over the cam surface4 at 6. The punchitself is detachably secured by a 'threaded member 28 to 5.-

In operation, when the brought into engagement as in the presentinstance, the two members approach far enough for the punch and die tohave their respective outer surfaces and edges come to a -point wheretheir lateral shifting will shear the top 11 of the blank as show n inFigure 2.

If it were not for the spring pressed member 18 holding the top 11 inproper position when this shearing takes placethere would be a crinklingor buckling of the blank or it might be disturbed in its position on thepunch leading to its being deformed in the shearing or trimmingoperation. In the present construction the blank is seated iirmly uponthe pin 8 and is held in its position by a spring pressed member 18 sothat the shearing can be effected neatly and quickly without warping ordisturbing the blank. In this instance, it is desired to secure acylindrical member with open ends.

While I have shown and described certain features as constituting myinvention, it will be understood that parts have been shown for purposesof illustration only, and that I do not desire to be limited to suchdetails, as obvious modifications will occur to a per-v son skilled inthe art. w

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent, is

1. In combination, a punch adapted to have lateral and vertical movementrelative to a die, a die, means in said die adjacent the punch and dieare with one another wall thereof having its outer end iush with theface of the die adapted to make contact with a blank on the punch,yielding means for maintaining said member in its outermost position andembracing the blank between it and the punch, means on said punch forsupporting a portion of the blank adjacent the die, whereby a blank maybe trimmed without deforming it.

2. In combination, a lpunch .adapted to have lateral and verticalmovement relative to a'die, a die, means in said die adjacent the wallthereof having its 'outer end Hush with the face of the die ladapted tomake- 'I' contact with a blank on the punch, yielding 15 adjacent thedie, and means for limiting the 20 relative movement toward one anotherof said punch and die, whereby a blank may be trimmed Without deformingit.

. In testimony whereof, I aiix my signature.

CHARLES M. BREHM.

